LDW931 is a 4G LTE USB wifi router , it takes power through USB port , work as wifi router . also can be pluged into computer USB port , work as USB modem . plug&play , doesn't need CD driver . Pls make sure your computer's software or Firewalls allow the USB modem driver to install ,otherwise it can't work as USB modem . This 4g USB modem do not include SIM card , user need to buy a NANO SIM card from local operators to use this device . This device offers mobile high speed 4G LTE Internet access service, It works in cars via standard usb port, or outdoor with powerbank via standard usb port. This wifi dongle support both 3G&4G networks. Support up to 10 users to access the Wi-Fi network at the same time. Small ,easy to carry . USB power , plug&play . easy to use . American version: FDD1900/1700/850/2600MHZ (b2/b4/b5/b7) American version works in most American countries . (such as USA, Chile, Canada, Mexico, , Bolivia, Colombia, Venezuela, Ecuador, Guatemala, Honduras, Nicaragua, Panama, Peru, Uruguay, Paraguay, Dominica) You can check frequency bands in link , https://.frequencycheck.com/countries Tablet ,Laptop, computer, books ,mobile phones and different types of WI-FI devices can connect to the 4G WiFi routert to access to Internet . High speed LTE Chipset, Support TDD-LTE/FDD-LTE/UMTS/ networks Multi languages Plug&Play,No need CD-ROM,No Driver Installation. Up to 10 users access to WiFi Super tiny 4G USB dongle ; Innovative Nano SIM-in-USB technology Support Win2000/2003/xp/Vista /Win 7/Win 8/Win 10/Linux Power input :5V1A Working temperature : -10C~45C Colour:White Material:plastic Size:88 x 28 x 12.3mm Package Contents: 1 x WiFi Router Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.